Hydraulic Operation

Line pressure hydraulic circuits:

• Line pressure from the pump is supplied to the manual valve.
• Line pressure is regulated by the pressure regulator valve.
• The pressure regulator valve is controlled by varying pressure from the LPC  solenoid through the LPC  circuit.

Torque converter circuits:

• Regulated line pressure from the pressure regulator valve is directed to the TCC  control valve through the CONV FD hydraulic circuit.
• When the TCC  is released, CONV FD pressure is directed to the TCC  RELEASE circuit by the TCC  control valve. Pressure from the TCC  RELEASE circuit releases the TCC  .
• Transmission fluid from the TCC  RELEASE returns to the TCC  control valve through the TCC  APPLY circuit.

Cooler and lubrication hydraulic circuits:

• The TCC  control valve directs transmission fluid from the TCC  APPLY circuit (return circuit from the torque converter when the TCC  is released) to the COOLER FEED circuit.
• In the COOLER FEED circuit, transmission fluid flows through the transmission fluid cooler or the thermal bypass valve to the LUBE circuit.

Solenoid hydraulic circuits:

• The LPC  solenoid applies varying pressure to the pressure control valve through the LPC  hydraulic circuit. The LPC  solenoid regulates line pressure by controlling the position of the pressure regulator valve.
• SSA  applies pressure to the forward (1, 2, 3, 4) clutch regulator valve to apply the forward clutch.
• SSD  applies pressure to the low/reverse/overdrive (4, 5, 6) clutch regulator valve to apply the O/D  clutch.

Clutch hydraulic circuits:

• Line pressure from the manual valve is directed to the multiplex shift valve through the DRIVE 1 hydraulic circuit.
• The multiplex shift valve directs DRIVE 1 pressure to the forward (1, 2, 3, 4) clutch regulator valve through the DRIVE 2, CB26FD/CB1234FD and CB1234 SUP hydraulic circuits. The DRIVE 2 hydraulic circuit also feeds the CBLR/C456 clutch regulator valve.
• Regulated CB1234 SUP pressure from the forward (1, 2, 3, 4) clutch regulator valve is directed to the forward (1, 2, 3, 4) clutch through the CB1234 hydraulic circuit to apply the clutch.
• Line pressure from the pump is supplied to the low/reverse/overdrive (4, 5, 6) regulator valve through the LINE hydraulic circuit.
• To apply the overdrive (4, 5, 6) clutch, SSD  applies varying solenoid pressure to the CBLR/C456 regulator and boost valves. As the CBLR/C456 regulator valve moves, it supplies the multiplex shift valve assembly and CBLR/C456 boost valve with regulated line pressure through the CBLR/C456 SUPPLY circuit. The CBLR/C456 boost valve directs the regulated line pressure to the opposite side of the CBLR/C456 regulator valve through the CBLR/C456 FDBK circuit for gradual overdrive (4, 5, 6) clutch engagement.
• The multiplex shift valve directs the transmission fluid to the multiplex manual valve through the C456 SUPPLY hydraulic circuit.
• The multiplex manual valve directs pressure from the C456 SUPPLY circuit to the O/D  (4, 5, 6) clutch through the C456 hydraulic circuit to apply the clutch.
• The C456 hydraulic circuit supplies pressure to the VALVE LATCH circuit to latch the multiplex shift valve and also supplies pressure to the intermediate (2, 6) clutch regulator valve.

For additional hydraulic circuit and information, refer to HYDRAULIC CIRCUITS .